The UNI-T UT3550 is an industrial high-precision handheld battery internal resistance tester adopting 1kHz AC 4-wire Kelvin measurement technology. It combines portable compact design with bench-grade measurement accuracy, supporting offline & live online non-destructive testing for lithium cells, lead-acid batteries, coin cells and UPS battery banks. Widely applied in battery production sorting, energy storage room maintenance, automotive battery service and lab battery reliability verificationUni-Trend US.

Equipped with 32-bit ARM microcontroller, IP65 dustproof & waterproof industrial enclosure, built-in 2000mAh lithium battery for long continuous operation. Dual-screen display design, integrated comparator binning, timed auto data logging, USB data export and Type-C remote control with SCPI protocol. It supports live online measurement of UPS without power cut to avoid system interruptionevents.uni-trend.com